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Bear Paw Sign: Xanthogranulomatous Pyelonephritis
Pablo Garrido-Abad1, Miguel Ángel Rodríguez-Cabello1, Roberto Vera-Berón2
1Department of Urology, Hospital Universitario Sanitas La Moraleja, Universidad Francisco de Vitoria, Madrid, Spain.
Abstract:
Xanthogranulomatous pyelonephritis is a rare form of chronic pyelonephritis in which the involved areas of the kidneys are destroyed and replaced by foam cells. It usually occurs in immunocompromised middle-aged females with ureteral obstruction or chronic urinary tract infection induced by the formation of renal stones. We herein report the case of a 44-year-old woman, with a history of left kidney staghorn calculi and recurrent urinary tract infections. Abdominal computed tomography showed the 'bear paw' sign, typical appearance of XGP and patient underwent a nephrectomy with uneventful post-operative course.
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